PHP Including files

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PHP Including files

• If pages have a common look and feel on your web
  site ? make up some template and include them in
  your php scripts
• Example
• Templated HTML files
• PHP script using the templated HTML files

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PHP Template file

• Inside file header.inc
• lthtmlgt
• lttitlegtOur web sitelt/titlegt
• ltbodygt
• lth1gtWeb Programming Languageslt/h1gt
• lth2gtPHPlt/h2gt

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PHP script including the template file

• lt? include(header.inc) ?gt
• ltbrgtltbrgt
• Today Introduction to PHP
• lt/bodygtlt/htmlgt
• The syntax is
• include(NAME_OF_FILE)

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PHP - Variables

• Variable name starts with a letter or _,
  followed by letters, _s, or digits
• PHP is a loosely typed language
• ? no declaration of variables (like Perl)
• Variable names are case sensitive
• // This is a PHP comment
• / Multi-line comment
• Same as C and Java
• /

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PHP - Variables

• a 3
• b 1.43
• c 1.3 e4
• d 7E-10
• first1 Mike // ok
• first2 Sarah // ok
• first3 Jane // ok

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PHP Printing variables

• a Mike
• echo hello a // ? hello Mike
• Using double quotes, variables expands
• echo hello a // ? hello a
• Using single quotes, variables do not expand
• print Using print Hello a
• print(using print( ) Hello a)
• print Printing using severalltbrgt
• Lines

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PHP Here document printing

• a Mike
• echo hello a // ? hello Mike
• Using double quotes, variables expands
• echo hello a // ? hello a
• Using single quotes, variables do not expand
• Here document syntax
• echo ltltltHI
• my name is a
• HI

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PHP Unix commands

• Using back quotes, we can run Unix commands from
  inside a php script
• today date
• echo Todays date is today
• ? Mon Aug 18 162721 EDT 2008

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PHP Variable scope

• A variable is in scope until the end of the PHP
  script (there is an exception for functions)